The trouble with holding stock is that you have paid all those costs upfront, so that is money out of pocket.
I don't know what Mongoose's finances are like, but no company (except for the really big ones) can afford to sit on stock unless you are sure you will sell them all. On Dragon's Den they hate it when people say they are going to buy stock.
I suppose the other danger with that is not having enough books to fill the orders, or too few.
Good idea, but I can't see it being viable commercially.
No worries about the books being late Mongoose - we waited ages for the novels and they were excellent, so I can wait for Book 11! As long as it's pretty much error-free, no worries.
Guess I'd better reread the originals for now